Excess weight put on ass? (9)
I believe the answer is:
saddlebag
'excess weight' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?
'put on ass?' is the wordplay.
I cannot really understand how this works, but
'put on' could be 'add' (I've seen this before) and 'add' is present in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for saddlebag that I've seen before include "riding accessory" , "bike accessory" , "storage place for bicycles" , "Storage for riders" , "Something used to carry items when riding" .)